Native to Eurasiaand from Newfoundland to Alaska, south to North Carolina and Tennessee. Vigorous, lushly foliaged plant, well adapted to life at the edges of pools, ponds, streams, and other moist locations. Given sufficient water, it can also be grown in borders; it looks good with bog irises and moisture-loving ferns. Reaches 2 feet tall and wide; rounded, 2- to 7 inches-wide, glossy green leaves are heart shaped at the base, give an almost tropical effect. Clusters of cheery yellow flowers to 2 inches across bloom in spring; a double-flowered form is available. Increase by divisions, or sow seed in boggy soil. Not favored by deer.